mercurial/subrepo.py

rebase: add --detach option to detach intermediate revisions (issue1950)

When rebasing an intermediate revision, rebase keeps a parent relationship
with the original parent. This option forces the removal of this relationship.
In more depth, it 'fakes' null merges between the target revision and the
ancestors of source, dropping every change from the ancestors.
The result is that every change in source and its descendants will be rebased,
ignoring the changes in its ancestors.

# subrepo.py - sub-repository handling for Mercurial
#
# Copyright 2009-2010 Matt Mackall <[e-mail]>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.

import errno, os, re, xml.dom.minidom, shutil
from i18n import _
import config, util, node, error
hg = None

nullstate = ('', '', 'empty')

def state(ctx):
    p = config.config()
    def read(f, sections=None, remap=None):
        if f in ctx:
            p.parse(f, ctx[f].data(), sections, remap, read)
        else:
            raise util.Abort(_("subrepo spec file %s not found") % f)

    if '.hgsub' in ctx:
        read('.hgsub')

    rev = {}
    if '.hgsubstate' in ctx:
        try:
            for l in ctx['.hgsubstate'].data().splitlines():
                revision, path = l.split(" ", 1)
                rev[path] = revision
        except IOError, err:
            if err.errno != errno.ENOENT:
                raise

    state = {}
    for path, src in p[''].items():
        kind = 'hg'
        if src.startswith('['):
            if ']' not in src:
                raise util.Abort(_('missing ] in subrepo source'))
            kind, src = src.split(']', 1)
            kind = kind[1:]
        state[path] = (src, rev.get(path, ''), kind)

    return state

def writestate(repo, state):
    repo.wwrite('.hgsubstate',
                ''.join(['%s %s\n' % (state[s][1], s)
                         for s in sorted(state)]), '')

def submerge(repo, wctx, mctx, actx):
    # working context, merging context, ancestor context
    if mctx == actx: # backwards?
        actx = wctx.p1()
    s1 = wctx.substate
    s2 = mctx.substate
    sa = actx.substate
    sm = {}

    repo.ui.debug("subrepo merge %s %s %s\n" % (wctx, mctx, actx))

    def debug(s, msg, r=""):
        if r:
            r = "%s:%s:%s" % r
        repo.ui.debug("  subrepo %s: %s %s\n" % (s, msg, r))

    for s, l in s1.items():
        if wctx != actx and wctx.sub(s).dirty():
            l = (l[0], l[1] + "+")
        a = sa.get(s, nullstate)
        if s in s2:
            r = s2[s]
            if l == r or r == a: # no change or local is newer
                sm[s] = l
                continue
            elif l == a: # other side changed
                debug(s, "other changed, get", r)
                wctx.sub(s).get(r)
                sm[s] = r
            elif l[0] != r[0]: # sources differ
                if repo.ui.promptchoice(
                    _(' subrepository sources for %s differ\n'
                      'use (l)ocal source (%s) or (r)emote source (%s)?')
                      % (s, l[0], r[0]),
                      (_('&Local'), _('&Remote')), 0):
                    debug(s, "prompt changed, get", r)
                    wctx.sub(s).get(r)
                    sm[s] = r
            elif l[1] == a[1]: # local side is unchanged
                debug(s, "other side changed, get", r)
                wctx.sub(s).get(r)
                sm[s] = r
            else:
                debug(s, "both sides changed, merge with", r)
                wctx.sub(s).merge(r)
                sm[s] = l
        elif l == a: # remote removed, local unchanged
            debug(s, "remote removed, remove")
            wctx.sub(s).remove()
        else:
            if repo.ui.promptchoice(
                _(' local changed subrepository %s which remote removed\n'
                  'use (c)hanged version or (d)elete?') % s,
                (_('&Changed'), _('&Delete')), 0):
                debug(s, "prompt remove")
                wctx.sub(s).remove()

    for s, r in s2.items():
        if s in s1:
            continue
        elif s not in sa:
            debug(s, "remote added, get", r)
            mctx.sub(s).get(r)
            sm[s] = r
        elif r != sa[s]:
            if repo.ui.promptchoice(
                _(' remote changed subrepository %s which local removed\n'
                  'use (c)hanged version or (d)elete?') % s,
                (_('&Changed'), _('&Delete')), 0) == 0:
                debug(s, "prompt recreate", r)
                wctx.sub(s).get(r)
                sm[s] = r

    # record merged .hgsubstate
    writestate(repo, sm)

def _abssource(repo, push=False):
    if hasattr(repo, '_subparent'):
        source = repo._subsource
        if source.startswith('/') or '://' in source:
            return source
        parent = _abssource(repo._subparent)
        if '://' in parent:
            if parent[-1] == '/':
                parent = parent[:-1]
            return parent + '/' + source
        return os.path.join(parent, repo._subsource)
    if push and repo.ui.config('paths', 'default-push'):
        return repo.ui.config('paths', 'default-push', repo.root)
    return repo.ui.config('paths', 'default', repo.root)

def subrepo(ctx, path):
    # subrepo inherently violates our import layering rules
    # because it wants to make repo objects from deep inside the stack
    # so we manually delay the circular imports to not break
    # scripts that don't use our demand-loading
    global hg
    import hg as h
    hg = h

    util.path_auditor(ctx._repo.root)(path)
    state = ctx.substate.get(path, nullstate)
    if state[2] not in types:
        raise util.Abort(_('unknown subrepo type %s') % state[2])
    return types[state[2]](ctx, path, state[:2])

# subrepo classes need to implement the following methods:
# __init__(self, ctx, path, state)
# dirty(self): returns true if the dirstate of the subrepo
#   does not match current stored state
# commit(self, text, user, date): commit the current changes
#   to the subrepo with the given log message. Use given
#   user and date if possible. Return the new state of the subrepo.
# remove(self): remove the subrepo (should verify the dirstate
#   is not dirty first)
# get(self, state): run whatever commands are needed to put the
#   subrepo into this state
# merge(self, state): merge currently-saved state with the new state.
# push(self, force): perform whatever action is analagous to 'hg push'
#   This may be a no-op on some systems.

class hgsubrepo(object):
    def __init__(self, ctx, path, state):
        self._path = path
        self._state = state
        r = ctx._repo
        root = r.wjoin(path)
        if os.path.exists(os.path.join(root, '.hg')):
            self._repo = hg.repository(r.ui, root)
        else:
            util.makedirs(root)
            self._repo = hg.repository(r.ui, root, create=True)
            f = file(os.path.join(root, '.hg', 'hgrc'), 'w')
            f.write('[paths]\ndefault = %s\n' % state[0])
            f.close()
        self._repo._subparent = r
        self._repo._subsource = state[0]

    def dirty(self):
        r = self._state[1]
        if r == '':
            return True
        w = self._repo[None]
        if w.p1() != self._repo[r]: # version checked out changed
            return True
        return w.dirty() # working directory changed

    def commit(self, text, user, date):
        self._repo.ui.debug("committing subrepo %s\n" % self._path)
        n = self._repo.commit(text, user, date)
        if not n:
            return self._repo['.'].hex() # different version checked out
        return node.hex(n)

    def remove(self):
        # we can't fully delete the repository as it may contain
        # local-only history
        self._repo.ui.note(_('removing subrepo %s\n') % self._path)
        hg.clean(self._repo, node.nullid, False)

    def _get(self, state):
        source, revision, kind = state
        try:
            self._repo.lookup(revision)
        except error.RepoError:
            self._repo._subsource = source
            self._repo.ui.status(_('pulling subrepo %s\n') % self._path)
            srcurl = _abssource(self._repo)
            other = hg.repository(self._repo.ui, srcurl)
            self._repo.pull(other)

    def get(self, state):
        self._get(state)
        source, revision, kind = state
        self._repo.ui.debug("getting subrepo %s\n" % self._path)
        hg.clean(self._repo, revision, False)

    def merge(self, state):
        self._get(state)
        cur = self._repo['.']
        dst = self._repo[state[1]]
        anc = dst.ancestor(cur)
        if anc == cur:
            self._repo.ui.debug("updating subrepo %s\n" % self._path)
            hg.update(self._repo, state[1])
        elif anc == dst:
            self._repo.ui.debug("skipping subrepo %s\n" % self._path)
        else:
            self._repo.ui.debug("merging subrepo %s\n" % self._path)
            hg.merge(self._repo, state[1], remind=False)

    def push(self, force):
        # push subrepos depth-first for coherent ordering
        c = self._repo['']
        subs = c.substate # only repos that are committed
        for s in sorted(subs):
            c.sub(s).push(force)

        self._repo.ui.status(_('pushing subrepo %s\n') % self._path)
        dsturl = _abssource(self._repo, True)
        other = hg.repository(self._repo.ui, dsturl)
        self._repo.push(other, force)

class svnsubrepo(object):
    def __init__(self, ctx, path, state):
        self._path = path
        self._state = state
        self._ctx = ctx
        self._ui = ctx._repo.ui

    def _svncommand(self, commands):
        cmd = ['svn'] + commands + [self._path]
        cmd = [util.shellquote(arg) for arg in cmd]
        cmd = util.quotecommand(' '.join(cmd))
        env = dict(os.environ)
        # Avoid localized output, preserve current locale for everything else.
        env['LC_MESSAGES'] = 'C'
        write, read, err = util.popen3(cmd, env=env, newlines=True)
        retdata = read.read()
        err = err.read().strip()
        if err:
            raise util.Abort(err)
        return retdata

    def _wcrev(self):
        output = self._svncommand(['info', '--xml'])
        doc = xml.dom.minidom.parseString(output)
        entries = doc.getElementsByTagName('entry')
        if not entries:
            return 0
        return int(entries[0].getAttribute('revision') or 0)

    def _wcchanged(self):
        """Return (changes, extchanges) where changes is True
        if the working directory was changed, and extchanges is
        True if any of these changes concern an external entry.
        """
        output = self._svncommand(['status', '--xml'])
        externals, changes = [], []
        doc = xml.dom.minidom.parseString(output)
        for e in doc.getElementsByTagName('entry'):
            s = e.getElementsByTagName('wc-status')
            if not s:
                continue
            item = s[0].getAttribute('item')
            props = s[0].getAttribute('props')
            path = e.getAttribute('path')
            if item == 'external':
                externals.append(path)
            if (item not in ('', 'normal', 'unversioned', 'external')
                or props not in ('', 'none')):
                changes.append(path)
        for path in changes:
            for ext in externals:
                if path == ext or path.startswith(ext + os.sep):
                    return True, True
        return bool(changes), False

    def dirty(self):
        if self._wcrev() == self._state[1] and not self._wcchanged()[0]:
            return False
        return True

    def commit(self, text, user, date):
        # user and date are out of our hands since svn is centralized
        changed, extchanged = self._wcchanged()
        if not changed:
            return self._wcrev()
        if extchanged:
            # Do not try to commit externals
            raise util.Abort(_('cannot commit svn externals'))
        commitinfo = self._svncommand(['commit', '-m', text])
        self._ui.status(commitinfo)
        newrev = re.search('Committed revision ([\d]+).', commitinfo)
        if not newrev:
            raise util.Abort(commitinfo.splitlines()[-1])
        newrev = newrev.groups()[0]
        self._ui.status(self._svncommand(['update', '-r', newrev]))
        return newrev

    def remove(self):
        if self.dirty():
            self._ui.warn(_('not removing repo %s because '
                            'it has changes.\n' % self._path))
            return
        self._ui.note('removing subrepo %s\n' % self._path)
        shutil.rmtree(self._ctx.repo.join(self._path))

    def get(self, state):
        status = self._svncommand(['checkout', state[0], '--revision', state[1]])
        if not re.search('Checked out revision [\d]+.', status):
            raise util.Abort(status.splitlines()[-1])
        self._ui.status(status)

    def merge(self, state):
        old = int(self._state[1])
        new = int(state[1])
        if new > old:
            self.get(state)

    def push(self, force):
        # nothing for svn
        pass

types = {
    'hg': hgsubrepo,
    'svn': svnsubrepo,
    }